Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Derivatives assets	$ 59.3	$ 7.6
Derivatives liabilities	459.0	427.3
FX Options on Acquisition-Related purchase Price [Member] | Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	41.2
Non-Derivatives Designated as Accounting Hedges [Member] | Net Investment Hedging [Member] | Long Term Debt [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	456.2	421.9
Derivatives Designated as Accounting Hedges [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	9.3	7.6
Derivatives liabilities	0.9	4.6
Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	2.2
Derivatives Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities		3.8
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	7.1	7.0
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	0.8	0.8
Derivatives Designated as Accounting Hedges [Member] | Net Investment Hedging [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets		0.6
Derivatives Designated as Accounting Hedges [Member] | Net Investment Hedging [Member] | Foreign Exchange Contract [Member] | Accounts Payable And Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	0.1
Derivatives Designated as Accounting Hedges [Member] | Net Investment Hedging [Member] | Cross-Currency Swap [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities		3.8
Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	8.8
Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Contract [Member] | Accounts Payable And Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives liabilities	1.9	$ 0.8
Derivatives Not Designated as Accounting Hedges [Member] | FX Options on Acquisition-Related purchase Price [Member] | Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives assets	$ 41.2